On Tue, Nov 30, 2010 at 3:37 PM, Brian Bockelman <[log in to unmask]> wrote: > You should be able to reproduce this by hand without ROOT, right? > > Create a client, call ReadV with buf=NULL and one entry in the vector, and verify the return code is zero instead of the length of the request. Sure, that's trivial. > Within ROOT, create a TTree with one branch and one entry and read it with TTreeCache. This I cannot see however (with your 087FAA16-F9E6-DF11-9D26-0030487CAF0E.root, and its EventMetaData tree), let's not waste more time on this though. I hope this fixes what you need fixed (and doesn't have any unexpected side effects). Lukasz